Signal Season 1 Episode 4
We Found the Killer
The ninth victim is Won-kyung, the woman Jae-han loves. A driver turns himself in, but Soo-hyun and Jae-han determine that his son is the real killer.
Guest Stars
Sung Hyun-mi
Jung Kyung-soon
Kim Ki-cheon
Lee Chan-goo
Lee Ki-seop
Lee Jin-hyung
Lee Shi-a
Kim Won-kyeong
Lee Do-yeop
Detective Park